I've never cared much about wallet security for new coins. For these purposes, I used only a separate computer and standard precautions.
It will be difficult for a beginner to mine many coins, and I myself try to choose a few coins rather than try to mine all the coins that appear in announcements.
I think thats a bit careless when you write that you dont care much about wallet security even the coins are new.
Using a other computer hopefully without internet is ok but the chances are still there that you get infected with USB Sticks or what every you use for getting the files.
Mining coins is not difficult, especially if you are a beginner, it might be a good thing to try it so that you can get familiar with the things like software and stuff.
That's the lure of web wallets that support many coins, but as I said using them is at the risk of not controlling the keys. A web wallet isn't much better
than storing coins on an exchange.
I fully agree on that.
I don't use USB flash drives on a separate computer. A new coin usually does not have a wallet, and therefore you have to run a node on a separate computer. The problem is that I don't know how reliable this software is because the coin is new. This is why I don’t care much about security and use the software that the developer provides.
WEB or GUI wallets appear a little later.